CR104B Vehicle Electrical And Mechanical Systems Practice Test

Open circuit voltage at about 25% state of charge is approximately which value?

12.06 volts 12.50 volts 11.80 volts 13.00 volts

Correct Answer:

12.06 volts

Explanation:

Open circuit voltage reflects how much charge is stored in a lead-acid battery when no load is on it and it’s given time to rest. For a typical 12V lead-acid battery, the voltage rises as the battery’s state of charge increases. At about 25% charge, the resting voltage is approximately 12.06 volts, making that value the best match for the question. If you see around 12.50 volts, you’re at a higher state of charge (roughly mid-to-high), not 25%. A reading near 11.80 volts indicates the battery is fairly discharged, while about 13.00 volts suggests the battery is being charged or has a surface charge from recent charging.

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